* Copyright 2005, Stephan Aßmus <superstippi@gmx.de>.
* Copyright 2008, Andrej Spielmann <andrej.spielmann@seh.ox.ac.uk>.
* All rights reserved. Distributed under the terms of the MIT License.
*
* DrawingMode implementing B_OP_ALPHA in "Pixel Overlay" mode on B_RGBA32.
*
*/
#ifndef DRAWING_MODE_ALPHA_PO_SUBPIX_H
#define DRAWING_MODE_ALPHA_PO_SUBPIX_H
#include "DrawingMode.h"
#include "GlobalSubpixelSettings.h"
#define BLEND_ALPHA_PO_SUBPIX(d, r, g, b, a1, a2, a3) \
{ \
BLEND16_SUBPIX(d, r, g, b, a1, a2, a3); \
}
void
blend_solid_hspan_alpha_po_subpix(int x, int y, unsigned len,
const color_type& c, const uint8* covers, agg_buffer* buffer,
const PatternHandler* pattern)
{
uint8* p = buffer->row_ptr(y) + (x << 2);
uint16 alphaRed;
uint16 alphaGreen;
uint16 alphaBlue;
const int subpixelL = gSubpixelOrderingRGB ? 2 : 0;
const int subpixelM = 1;
const int subpixelR = gSubpixelOrderingRGB ? 0 : 2;
do {
rgb_color color = pattern->ColorAt(x, y);
alphaRed = color.alpha * covers[subpixelL];
alphaGreen = color.alpha * covers[subpixelM];
alphaBlue = color.alpha * covers[subpixelR];
BLEND_ALPHA_PO_SUBPIX(p, color.red, color.green, color.blue,
alphaBlue, alphaGreen, alphaRed);
covers += 3;
p += 4;
x++;
len -= 3;
} while (len);
}
#endif
